NYHA Classification for Congestive Cardiac Failure

The New York Heart Association (NYHA) Functional Classification is used to grade the severity of congestive cardiac failure. Symptoms it refers to include dyspnea and chest pain.

NYHA Class	Symptoms
I	No symptoms and no limitation in ordinary physical activity, e.g. shortness of breath when walking, climbing stairs etc.
II	Mild symptoms (mild shortness of breath and/or angina) and slight limitation during ordinary activity.
III	Marked limitation in activity due to symptoms, even during less-than-ordinary activity, e.g. walking short distances (3-15 feet). Comfortable only at rest.
IV	Severe limitations. Experiences symptoms even while at rest. Mostly bedbound patients.